Germline BMP9 mutation causes idiopathic pulmonary arterial hypertension

Background Idiopathic pulmonary arterial hypertension (IPAH) is a rare disease with high heritability. Although several predisposing genes have been linked to IPAH, the genetic aetiology remains unknown for a large number of IPAH cases. Methods We conducted an exome-wide gene-based burden analysis on two independent case–control studies, including a total of 331 IPAH cases and 10 508 controls. Functional assessments were conducted to analyse the effects of genetic mutations on protein biosynthesis and function. Results The gene encoding human bone morphogenetic protein 9 (BMP9) was identified as a novel genetic locus displaying exome-wide association with IPAH in the discovery cohort (OR 18.8; p=1.9×10−11). This association was authenticated in the independent replication cohort (p=1.0×10−5). Collectively, the rare coding mutations in BMP9 occurred in 6.7% of cases, ranking this gene second to BMPR2, comprising a combined significance of 2.7×10−19 (OR 21.2). Intriguingly, the patients with BMP9 mutations had lower plasma levels of BMP9 than those without. Functional studies showed that the BMP9 mutations led to reduced BMP9 secretion and impaired anti-apoptosis ability in pulmonary arterial endothelial cells. Conclusion We identify BMP9 as an IPAH culprit gene. BMP9 is a new culprit gene for IPAH ranking second to BMPR2. The rare deleterious mutations in BMP9, which lead to the reduction in BMP9 secretion and impairment in BMP9 function, account for 6.7% of IPAH cases. http://ow.ly/h0tS30mXr8j

• Publication year

  2018

• Venue

  European Respiratory Journal

• Publication date

  2018-12-21

• Fields of study

  Medicine

• Identifiers
  DOI 10.1183/13993003.01609-2018PMID 30578397
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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